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Ceylon vs. Cassia: A Critical Distinction

Not all cinnamon is equal — one type can damage your liver in high doses.

There are two fundamentally different spices sold under the name "cinnamon," and confusing them could be harmful to your health if you consume cinnamon regularly or in supplemental doses.

Cassia cinnamon (Cinnamomum cassia, also called Chinese cinnamon) is what you almost certainly have in your pantry. It accounts for the vast majority of cinnamon sold in the United States and Europe. It is cheap, strong-flavored, and widely available.

Ceylon cinnamon (Cinnamomum verum, also called "true cinnamon") is lighter in color, milder in flavor, more expensive, and primarily grown in Sri Lanka. It is the one you want.

Why This Distinction Matters: Coumarin

The critical difference is coumarin, a naturally occurring compound found in high concentrations in Cassia cinnamon. Cassia contains roughly 1% coumarin by weight, while Ceylon cinnamon contains only trace amounts — approximately 0.004% [1].

Coumarin is hepatotoxic. At high doses, it damages the liver [2]. The European Food Safety Authority set a tolerable daily intake (TDI) of 0.1 mg per kilogram of body weight. For a 70 kg adult, that is just 7 mg per day — which you can exceed with as little as one teaspoon of Cassia cinnamon [4].

If you are taking cinnamon daily for blood sugar benefits (which the research supports at 1-6 grams per day), using Cassia cinnamon means you would be consuming many times the safe coumarin limit every single day.

Ceylon cinnamon has negligible coumarin. You can take therapeutic doses without liver risk [1].

How to Tell Them Apart

  • Sticks: Ceylon cinnamon sticks have many thin, papery layers rolled together (like a cigar). Cassia sticks are a single thick, hard bark rolled into a scroll.
  • Color: Ceylon is tan-brown and lighter. Cassia is dark reddish-brown.
  • Texture: Ceylon crumbles easily. Cassia is hard and woody.
  • Price: If it is suspiciously cheap, it is Cassia.
  • Label: If the package just says "cinnamon" without specifying, it is almost certainly Cassia.

What Both Types Share

Both Ceylon and Cassia cinnamon contain cinnamaldehyde, the compound responsible for cinnamon's flavor and many of its health benefits. Both types have demonstrated anti-inflammatory, antioxidant, and blood-sugar-lowering properties in research [3].

The key bioactive compounds in cinnamon include cinnamaldehyde, cinnamic acid, and cinnamate — all present in both varieties [3]. The anti-inflammatory effects operate through inhibition of NF-kB and other inflammatory pathways, and these mechanisms are not dependent on coumarin content.

The bottom line: if you are using cinnamon as a daily supplement (which the evidence supports for blood sugar management), switch to Ceylon. The health benefits are comparable, and you eliminate the coumarin risk entirely [1][4].

References

  1. Coumarin content of cinnamon-containing food products on the German marketWoehrlin F, Maas RH, Ballmer-Weber BK, Sander I. Journal of Agricultural and Food Chemistry, 2010. PubMed 20024932 →
  2. Coumarin: a phytochemical with potential therapeutic interestJain PK, Joshi H. Journal of Applied Pharmaceutical Science, 2012. PubMed 22946853 →
  3. Cinnamon: a multifaceted medicinal plantRao PV, Gan SH. Evidence-Based Complementary and Alternative Medicine, 2014. PubMed 24019277 →
  4. Abraham K, Wohrlin F, Lindtner O, Heinemeyer G, Lampen A. Toxicology and risk assessment of coumarinAbraham K, Wohrlin F, Lindtner O, Heinemeyer G, Lampen A. Molecular Nutrition & Food Research, 2010. PubMed 20357803 →

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